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Gregory Bowman wrote: > Yes, but I don't actually want to swap a and c (convention that a is shorter than c), but instead flip k and keep h and l the same. Incidentally, it is not immediately obvious to me why in matrix I cited below that the new l is h+l: > -1 0 0 > 0 -1 0 > 1 0 1 > > Greg Because -a and c would give acute beta angle, by convention should be obtuse?